Estimating Energy Efficiency of Buildings Matthew Wysocki Introduction
Estimating Energy Efficiency of Buildings Matthew Wysocki
Introduction � Research into building efficiency � Heating, ventilation, and cooling � Software simulations � UCI Machine Learning Repository
Dataset � Generated using Ecotect � Using 8 different parameters � Relative compactness � Surface area � Wall area � Roof Area � Overall Height � Orientation � Glazing Area Distribution � Constant volume � Same Materials � 768 samples http: //ad 009 cdnb. archdaily. net/wp-content/uploads/2009/05/1149184021_total-incident-solar-radiation 528 x 369. jpg
Algorithm � Regression tree � Each node represents a binary decision � Leaves represent outputs � Random forest method http: //www. biomedcentral. com/content/figures/1471 -2105 -7 -101 -4 -l. jpg
Correlation coefficients (Heating load only) Input Value Pearson productmoment coefficient Spearman’s rank correlation coefficient Kendall’s rank correlation coefficient Relative Compactness 0. 6223 0. 6221 0. 3541 Surface Area -0. 6581 -0. 6221 -0. 3541 Wall area 0. 4557 0. 4715 0. 3424 Roof area -0. 8618 -0. 8040 -0. 6102 Overall height 0. 8894 0. 8613 0. 7040 Orientation -0. 0026 -0. 0042 -0. 0031 Glazing Area 0. 2698 0. 3229 0. 2632 Glazing Area Distribution 0. 0874 0. 0683 0. 0487
Estimating Error Output variable Mean Absolute Error Mean Squared Error Mean Relative Error Heating load 0. 52 +- 0. 16 1. 10 +- 0. 50 2. 18 +- 0. 61 Cooling 1. 46 +- 0. 21 6. 56 +- 1. 57 4. 61 +- 0. 68
Conclusions � Accurate estimates of outputs based on input variables � Good understanding of correlations � Unnecessary to run many simulations
References Tsanas, A. Xifara: 'Accurate quantitative estimation of energy performance of residential buildings using statistical machine learning tools', Energy and Buildings, Vol. 49, pp. 560 -567, 2012 � Lee, S. , Park, Y. , and Kim, C. (2012) Investigating the Set of Parameters Influencing Building Energy Consumption. ICSDC 2011: pp. 211 -221. � *Figures without references were generated by me
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